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Unformatted text preview: Econ 310: Problem Set #9 Solutions Andres AradillasLopez 1. Exercise 7.20. (a) df = 19. (b) 2 : 093 < t < 2 : 205 (c) 0 : 02 < P < : 025. (d) t = 2 : 10 is signiflcant at 5%, but not at 1%. (e) From software, P = 0 : 0247. 2. Exercise 7.36. (a) „ x = 5 : 36 mg/dl and s = 0 : 6653 mg/dl, so SE „ x = 0 : 2716 mg/dl. (b) For df = 5, we have t / = 2 : 015, so the interval is 4.819 to 5.914 mg/dl. 3. Exercise 7.76. (a) We test H : „ = „ 3 vs. H a „ > „ 3 . For the two samples, we flnd „ x = 48 : 705 ;s = 1 : 5344 ; „ x 3 = 21 : 795, and s 3 = 0 : 7707 mg/100g; thus SE D = 1 : 2142 and t = 22 : 16. This gives either P = 0 : 0080 (df=1.47) or P = 0 : 0143 (df=1); either way, this is fairly strong evidence that vitamin C is lost in storage. (b) Options for the 90% confldence interval for „ ¡ „ 3 are given in the table. df t / Confldence Interval 1.47 4.7037 21.1988 to 32.6212 1 6.3137 19.2439 to 34.5761 1 6.314 19.2436 to 34.5764 4. Exercise 7.78....
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This note was uploaded on 07/14/2011 for the course ECON 2023 taught by Professor Rush during the Spring '08 term at University of Florida.
 Spring '08
 Rush

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